package com.hotpot.comm.config.interceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

/**
 * 描述:自定义拦截器
 * @author myx
 * @date 2017年7月10日 下午1:37:39
 */
public class MyInterceptor implements HandlerInterceptor{

	/**
	 * 在请求处理之前进行调用（Controller方法调用之前）
	 * @param request
	 * @param response
	 * @param handler
	 * @return 只有返回true才会继续向下执行，返回false取消当前请求
	 * @throws Exception
	 * @see org.springframework.web.servlet.HandlerInterceptor#preHandle(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.Object)
	 */
	@Override
	public boolean preHandle(HttpServletRequest request,
			HttpServletResponse response, Object handler) throws Exception {
		response.setHeader("Access-Control-Allow-Origin", "*");//解决跨域问题
		return true;
	}

	/**
	 * 请求处理之后进行调用，但是在视图被渲染之前（Controller方法调用之后）
	 * @param request
	 * @param response
	 * @param handler
	 * @param modelAndView
	 * @throws Exception
	 * @see org.springframework.web.servlet.HandlerInterceptor#postHandle(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.Object, org.springframework.web.servlet.ModelAndView)
	 */
	@Override
	public void postHandle(HttpServletRequest request,
			HttpServletResponse response, Object handler,
			ModelAndView modelAndView) throws Exception {
		
	}

	/**
	 * 在整个请求结束之后被调用，也就是在DispatcherServlet 渲染了对应的视图之后执行（主要是用于进行资源清理工作）
	 * @param request
	 * @param response
	 * @param handler
	 * @param ex
	 * @throws Exception
	 * @see org.springframework.web.servlet.HandlerInterceptor#afterCompletion(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.Object, java.lang.Exception)
	 */
	@Override
	public void afterCompletion(HttpServletRequest request,
			HttpServletResponse response, Object handler, Exception ex)
			throws Exception {
		
	}

}
